Linux

How to connect to a Cisco VPN in Ubuntu 18.04 LTS

Posted on

Here’s the simple steps for you to connect to a Cisco VPN in Ubuntu 18.04 LTS. Cisco, an American company is the leading provider and manufacturer of enterprise network devices, telecommunication hardware, networking security and networking software. According to computer profile as of April 2018, Cisco holds a 73.9% market which makes it the undisputed […]

Linux

Bash string manipulation in program arguments

Posted on

In this code snippet, I would like to run an application with a URL payload based on date and time. This code will be executed in a specific schedule everyday and I would like to dynamically inject the date and time in the program argument when the program executes. ./json2csv rules.json “ncp” “http://localhost:8080/api/zget?eid=get-ncp-mv-by-starttime-endtime&starttime=$(date –date=’yesterday’ +\%Y-\%m-\%d)+00:00:00&endtime=$(date […]

Linux

A simple firewall-cmd cheatsheet

Posted on

Get Default Zone Get Active Zones List Zone Services Add a permanent port into a zone Remove a permanent port from a zone Firewall-cmd reload I tested this using CentOS 7 with firewalld service running. Get Default Zone To know the default zone, use this command firewall-cmd –get-default-zone Get Active Zones firewall-cmd –get-active-zones List Zone […]

General

Use Cloudflare as Dynamic DNS

Posted on

I would like to share how I use Cloudflare as Dynamic DNS. I am using Dynamic DNS service from No-IP for three years until a colleague of mine mentioned about Cloudflare’s really fast global DNS. Initially, I thought that Cloudflare was just a CDN and an Internet company that protects websites from Distributed Denial-of-Service (DDoS) […]

Tutorials

Configure Tomcat To Run on Linux Startup

Posted on
Auto-start Apache Tomcat on Linux

If you are using the core version of Apache Tomcat and would like auto-start it on Linux here are the simple steps. I assume that you already have a running Apache Tomcat and know how to navigate to the terminal and have necessary system permission to proceed with this tutorial. Depending on the distribution that […]